package com.gls.security.form.login.controller;

import com.gls.security.core.support.SimpleResponse;
import com.gls.security.form.login.properties.FormLoginConstants;
import com.gls.security.form.login.properties.FormLoginProperties;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.security.web.DefaultRedirectStrategy;
import org.springframework.security.web.RedirectStrategy;
import org.springframework.security.web.savedrequest.HttpSessionRequestCache;
import org.springframework.security.web.savedrequest.RequestCache;
import org.springframework.security.web.savedrequest.SavedRequest;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseStatus;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @author lizhiyong
 */
@Slf4j
@RestController
public class FormLoginSecurityController {

    private RequestCache requestCache = new HttpSessionRequestCache();

    private RedirectStrategy redirectStrategy = new DefaultRedirectStrategy();

    @Autowired
    private FormLoginProperties formLoginProperties;

    /**
     * 当需要身份认证时，跳转到这里
     *
     * @param request
     * @param response
     * @return
     * @throws IOException
     */
    @RequestMapping(FormLoginConstants.DEFAULT_UNAUTHENTICATION_URL)
    @ResponseStatus(code = HttpStatus.UNAUTHORIZED)
    public SimpleResponse requireAuthentication(HttpServletRequest request, HttpServletResponse response)
            throws IOException {

        SavedRequest savedRequest = requestCache.getRequest(request, response);

        if (savedRequest != null) {
            String targetUrl = savedRequest.getRedirectUrl();
            log.info("引发跳转的请求是:" + targetUrl);
            if (StringUtils.endsWithIgnoreCase(targetUrl, ".html")) {
                redirectStrategy.sendRedirect(request, response, formLoginProperties.getLoginPage());
            }
        }

        return new SimpleResponse("访问的服务需要身份认证，请引导用户到登录页");
    }
}
